What Good does Prison do?

If the goal is rehab, why are their sentences based on time, not progress?

So what about the person who died? Don't you think their family has a bit of resentment or hatred against the person? Theres absolutely no reason for you to take someone else the only thing they have total control of, their life.

So I do believe prison is ok how it is, if they only feel worst by being in prison and go outside seeking for revenge they can know they are gonna finish even worst. So its their decision.